Toy soldiers made by the Multiple Plastics Corporation were always inferior to those of Marx, but while Marx merely toyed around with the use of separate accessories, MPC went for it in a big way.
This line of MPC soldiers is known collectively as Ringhands, because many of the early figures had holes bored through their hands to accommodate weapons and other tools of their trade. Later figures, like these space explorers, had empty, grasping hands rather than true rings. (For a look at true Ringhands, check out the very cool MPC pirates HERE.)
MPC saved a few bucks on these space guys by using molds made for their WWII soldiers, then casting them in colors other than olive green. A kneeling figure, designed to wear an army helmet and aim a rifle, was also included in the spaceman set, but he wasn't fit for missions because none of the space accessories fit him.
More Toy Soldiers HERE.